摘要
对碱激胶凝材料与水-水泥体系的化学收缩或膨胀进行了试验研究,其中水-水泥体系为对比样.结果表明:室温(20±1)℃条件下,水-水泥体系、碱激发矿渣和碱激发粉煤灰体系都发生化学收缩,且其收缩值随反应龄期的延长而增加;在相同的龄期,水-水泥体系的化学收缩最大,碱激发矿渣体系的化学收缩最小;碱激发偏高岭土体系发生化学膨胀,且其膨胀值随反应龄期的延长而增加;碱激发偏高岭土的反应产物是无定形类沸石(因为具有沸石的NH4+离子交换性质),其中低聚合度的产物对化学膨胀有很大贡献;碱激发矿渣体系和碱激发粉煤灰体系的主要反应产物的性质与水泥产物的性质相似,但是存在少量无定形类沸石,这对化学收缩有部分抵消作用.
Test investigation on the chemical shrinkage or expansion of alkali - activated cementing materials and water-cement were carried out in this paper, in which water-cement was as control sample. The results showed that under curing temperature of 20 ± 1 ℃ condition, alkali-activated slag and alkali-activated fly ash cementing materials and water - cement all showed chemical shrinkage and those values grew with the increase of chemical reaction ages; of which, the chemical shrinkage values of water-cement were the biggest and that of alkali-activated slag cementing material were the smallest at the same age; alkali-activated metakaolinite cementing material showed chemical expansion and its value grew with the increase of chemical reaction ages, its reaction products were amorphous analogues of zeolites （because of having the capacity of NH4^＋ ion exchange of zeolites）, in which the reaction products with low degree of polymerization did notable contribution for the chemical expansion; the main reaction products alkali-activated slag and alkali-activated fly ash cementing materials were similar to that of water-cement, in which there also were a small amount of amorphous analogues of zeolites, this partly neutralized the chemical shrinkage.
出处
《郑州大学学报（工学版）》
CAS
2008年第4期69-72,共4页
Journal of Zhengzhou University（Engineering Science）
基金
国家自然科学基金资助项目(50572096)
关键词
碱激发胶凝材料
化学收缩
无定形类沸石
NH4^+离子交换容量
alkali-activated cementing materials
chemical shrinkage or expansion
amorphous analogues ofzeolites
capacity of NH4^＋ ion exchange
